<template>
	<view class="con">
		<template v-if="viewWidth">
			<movable-area class="area" :style="{ height: areaHeight }" @mouseenter="mouseenter"
				@mouseleave="mouseleave">
				<movable-view v-for="(item, index) in imageList" :key="item.id" class="view" direction="all" :y="item.y"
					:x="item.x" :damping="40" :disabled="item.disable" @change="onChange($event, item)"
					@touchstart="touchstart(item)" @mousedown="touchstart(item)" @touchend="touchend(item)"
					@mouseup="touchend(item)" :style="{
          width: viewWidth + 'px', 
          height: viewWidth + 'px', 
          'z-index': item.zIndex, 
          opacity: item.opacity 
        }">
					<view class="area-con" :style="{
            width: childWidth, 
            height: childWidth, 
            borderRadius: borderRadius + 'rpx',
            transform: 'scale(' + item.scale + ')' 
          }">
						<image class="pre-image" :src="item.src" mode="aspectFill"></image>
						<view class="del-con" @click="delImages(item, index)" @touchstart.stop="delImageMp(item, index)"
							@touchend.stop="nothing()" @mousedown.stop="nothing()" @mouseup.stop="nothing()">
							<view class="del-wrap">
								<image class="del-image"
									src="">
								</image>
							</view>
						</view>
					</view>
				</movable-view>
				<view class="add" v-if="imageList.length < number"
					:style="{ top: add.y, left: add.x, width: viewWidth + 'px', height: viewWidth + 'px' }"
					@click="addImages">
					<view class="add-wrap"
						:style="{ width: childWidth, height: childWidth, borderRadius: borderRadius + 'rpx' }">
						<image style="width: 54rpx;height: 54rpx;"
							src="">
						</image>
					</view>
				</view>
			</movable-area>

		</template>
	</view>
</template>

<script>
	import {
		BASE_URL
	} from '@/config/app';
	import {
		mapGetters
	} from "vuex";
	export default {
		emits: ['input', 'update:modelValue'],
		props: {
			// 排序图片
			value: {
				type: Array,
				default: function() {
					return []
				}
			},
			// 排序图片
			modelValue: {
				type: Array,
				default: function() {
					return []
				}
			},
			// 从 list 元素对象中读取的键名
			keyName: {
				type: String,
				default: null
			},
			// 选择图片数量限制
			number: {
				type: Number,
				default: 6
			},
			// 图片父容器宽度（实际显示的图片宽度为 imageWidth / 1.1 ），单位 rpx
			// imageWidth > 0 则 cols 无效
			imageWidth: {
				type: Number,
				default: 0
			},
			// 图片列数
			cols: {
				type: Number,
				default: 3
			},
			// 图片圆角，单位 rpx
			borderRadius: {
				type: Number,
				default: 0
			},
			// 图片周围空白填充，单位 rpx
			padding: {
				type: Number,
				default: 10
			},
			// 拖动图片时放大倍数 [0, ∞)
			scale: {
				type: Number,
				default: 1.1
			},
			// 拖动图片时不透明度
			opacity: {
				type: Number,
				default: 0.7
			},
			// 自定义添加
			addImage: {
				type: Function,
				default: null
			},
			// 删除确认
			delImage: {
				type: Function,
				default: null
			}
		},
		data() {
			return {
				imageList: [],
				width: 0,
				add: {
					x: 0,
					y: 0
				},
				colsValue: 0,
				viewWidth: 0,
				tempItem: null,
				timer: null,
				changeStatus: true,
				preStatus: true,
				first: true,
			}
		},
		computed: {
			...mapGetters(["isLogin", "app_token"]),
			areaHeight() {
				let height = ''
				// return '355px'
				if (this.imageList.length < this.number) {
					height = (Math.ceil((this.imageList.length + 1) / this.colsValue) * this.viewWidth).toFixed() + 'px'
				} else {
					height = (Math.ceil(this.imageList.length / this.colsValue) * this.viewWidth).toFixed() + 'px'
				}
				console.log('areaHeight', height)
				return height
			},
			childWidth() {
				return this.viewWidth - this.rpx2px(this.padding) * 2 + 'px'
			},
		},
		watch: {
			value: {
				handler(n) {
					if (!this.first && this.changeStatus) {
						console.log('watch', n)
						let flag = false
						for (let i = 0; i < n.length; i++) {
							if (flag) {
								this.addProperties(this.getSrc(n[i]))
								continue
							}
							if (this.imageList.length === i || this.imageList[i].src !== this.getSrc(n[i])) {
								flag = true
								this.imageList.splice(i)
								this.addProperties(this.getSrc(n[i]))
							}
						}
					}
				},
				deep: true
			},
			modelValue: {
				handler(n) {
					if (!this.first && this.changeStatus) {
						console.log('watch', n)
						let flag = false
						for (let i = 0; i < n.length; i++) {
							if (flag) {
								this.addProperties(this.getSrc(n[i]))
								continue
							}
							if (this.imageList.length === i || this.imageList[i].src !== this.getSrc(n[i])) {
								flag = true
								this.imageList.splice(i)
								this.addProperties(this.getSrc(n[i]))
							}
						}
					}
				},
				deep: true
			},
		},
		created() {
			this.width = uni.getSystemInfoSync().windowWidth
		},
		mounted() {
			const query = uni.createSelectorQuery().in(this)
			query.select('.con').boundingClientRect(data => {
				this.colsValue = this.cols
				this.viewWidth = data.width / this.cols
				if (this.imageWidth > 0) {
					this.viewWidth = this.rpx2px(this.imageWidth)
					this.colsValue = Math.floor(data.width / this.viewWidth)
				}
				let list = this.value
				// #ifdef VUE3
				list = this.modelValue
				// #endif
				for (let item of list) {
					this.addProperties(this.getSrc(item))
				}
				this.first = false

			})
			query.exec()
		},
		methods: {
			getSrc(item) {
				if (this.keyName !== null) {
					return item[this.keyName]
				}
				return item
			},
			onChange(e, item) {
				if (!item) return
				item.oldX = e.detail.x
				item.oldY = e.detail.y
				if (e.detail.source === 'touch') {
					if (item.moveEnd) {
						item.offset = Math.sqrt(Math.pow(item.oldX - item.absX * this.viewWidth, 2) + Math.pow(item.oldY -
							item
							.absY * this.viewWidth, 2))
					}
					let x = Math.floor((e.detail.x + this.viewWidth / 2) / this.viewWidth)
					if (x >= this.colsValue) return
					let y = Math.floor((e.detail.y + this.viewWidth / 2) / this.viewWidth)
					let index = this.colsValue * y + x
					if (item.index != index && index < this.imageList.length) {
						this.changeStatus = false
						for (let obj of this.imageList) {
							if (item.index > index && obj.index >= index && obj.index < item.index) {
								this.change(obj, 1)
							} else if (item.index < index && obj.index <= index && obj.index > item.index) {
								this.change(obj, -1)
							} else if (obj.id != item.id) {
								obj.offset = 0
								obj.x = obj.oldX
								obj.y = obj.oldY
								setTimeout(() => {
									this.$nextTick(() => {
										obj.x = obj.absX * this.viewWidth
										obj.y = obj.absY * this.viewWidth
									})
								}, 0)
							}
						}
						item.index = index
						item.absX = x
						item.absY = y
						if (!item.moveEnd) {
							setTimeout(() => {
								this.$nextTick(() => {
									item.x = item.absX * this.viewWidth
									item.y = item.absY * this.viewWidth
								})
							}, 0)
						}
						// console.log('bbb', JSON.parse(JSON.stringify(item)));
						this.sortList()
					}
				}
			},
			change(obj, i) {
				obj.index += i
				obj.offset = 0
				obj.x = obj.oldX
				obj.y = obj.oldY
				obj.absX = obj.index % this.colsValue
				obj.absY = Math.floor(obj.index / this.colsValue)
				setTimeout(() => {
					this.$nextTick(() => {
						obj.x = obj.absX * this.viewWidth
						obj.y = obj.absY * this.viewWidth
					})
				}, 0)
			},
			touchstart(item) {
				this.imageList.forEach(v => {
					v.zIndex = v.index + 9
				})
				item.zIndex = 99
				item.moveEnd = true
				this.tempItem = item
				this.timer = setTimeout(() => {
					item.scale = this.scale
					item.opacity = this.opacity
					clearTimeout(this.timer)
					this.timer = null
				}, 200)
			},
			touchend(item) {
				this.previewImage(item)
				item.scale = 1
				item.opacity = 1
				item.x = item.oldX
				item.y = item.oldY
				item.offset = 0
				item.moveEnd = false
				setTimeout(() => {
					this.$nextTick(() => {
						item.x = item.absX * this.viewWidth
						item.y = item.absY * this.viewWidth
						this.tempItem = null
						this.changeStatus = true
					})
					// console.log('ccc', JSON.parse(JSON.stringify(item)));
				}, 0)
				// console.log('ddd', JSON.parse(JSON.stringify(item)));
			},
			previewImage(item) {
				if (this.timer && this.preStatus && this.changeStatus && item.offset < 28.28) {
					clearTimeout(this.timer)
					this.timer = null
					const list = this.value || this.modelValue
					let srcList = list.map(v => this.getSrc(v))
					console.log(list, srcList);
					uni.previewImage({
						urls: srcList,
						current: item.src,
						success: () => {
							this.preStatus = false
							setTimeout(() => {
								this.preStatus = true
							}, 600)
						},
						fail: (e) => {
							console.log(e);
						}
					})
				} else if (this.timer) {
					clearTimeout(this.timer)
					this.timer = null
				}
			},
			mouseenter() {
				//#ifdef H5
				this.imageList.forEach(v => {
					v.disable = false
				})
				//#endif

			},
			mouseleave() {
				//#ifdef H5
				if (this.tempItem) {
					this.imageList.forEach(v => {
						v.disable = true
						v.zIndex = v.index + 9
						v.offset = 0
						v.moveEnd = false
						if (v.id == this.tempItem.id) {
							if (this.timer) {
								clearTimeout(this.timer)
								this.timer = null
							}
							v.scale = 1
							v.opacity = 1
							v.x = v.oldX
							v.y = v.oldY
							this.$nextTick(() => {
								v.x = v.absX * this.viewWidth
								v.y = v.absY * this.viewWidth
								this.tempItem = null
							})
						}
					})
					this.changeStatus = true
				}
				//#endif
			},
			addImages() {
				var that = this;
				if (typeof this.addImage === 'function') {
					this.addImage.bind(this.$parent)()
				} else {
					let checkNumber = this.number - this.imageList.length
					uni.chooseImage({
						count: checkNumber,
						sourceType: ['album', 'camera'],
						success: res => {
							let count = checkNumber <= res.tempFilePaths.length ? checkNumber : res
								.tempFilePaths.length
							for (let i = 0; i < count; i++) {
								uni.showLoading({
									title: '上传中...'
								})
								uni.uploadFile({
									url: BASE_URL + '/users/upload/upload_url',
									filePath: res.tempFilePaths[i],
									name: 'img',
									formData: {
										'app_token': that.app_token,
									},
									success: (uploadFileRes) => {
										//接口返回的数据
										var res = JSON.parse(uploadFileRes.data)
										if (res.status == 1) {
											that.$util.Tips({
												title: res.msg
											})
											this.addProperties(res.data)
										} else {
											that.$util.Tips({
												title: res.msg
											})
										}
										uni.hideLoading()
										this.sortList()
									}
								});
								// this.addProperties(res.tempFilePaths[i])
							}
							// this.sortList()
						}
					})
				}
			},
			delImages(item, index) {
				if (typeof this.delImage === 'function') {
					this.delImage.bind(this.$parent)(() => {
						this.delImageHandle(item, index)
					})
				} else {
					this.delImageHandle(item, index)
				}
			},
			delImageHandle(item, index) {
				this.imageList.splice(index, 1)
				for (let obj of this.imageList) {
					if (obj.index > item.index) {
						obj.index -= 1
						obj.x = obj.oldX
						obj.y = obj.oldY
						obj.absX = obj.index % this.colsValue
						obj.absY = Math.floor(obj.index / this.colsValue)
						this.$nextTick(() => {
							obj.x = obj.absX * this.viewWidth
							obj.y = obj.absY * this.viewWidth
						})
					}
				}
				this.add.x = (this.imageList.length % this.colsValue) * this.viewWidth + 'px'
				this.add.y = Math.floor(this.imageList.length / this.colsValue) * this.viewWidth + 'px'
				this.sortList()
			},
			delImageMp(item, index) {
				//#ifdef MP
				this.delImages(item, index)
				//#endif
			},
			sortList() {
				console.log('sortList');
				const result = []
				let source = this.value
				// #ifdef VUE3
				source = this.modelValue
				// #endif

				let list = this.imageList.slice()
				list.sort((a, b) => {
					return a.index - b.index
				})
				for (let s of list) {
					let item = source.find(d => this.getSrc(d) == s.src)
					if (item) {
						result.push(item)
					} else {
						if (this.keyName !== null) {
							result.push({
								[this.keyName]: s.src
							})
						} else {
							result.push(s.src)
						}
					}
				}

				this.$emit("input", result);
				this.$emit("update:modelValue", result);
			},
			addProperties(item) {
				console.log(item);
				let absX = this.imageList.length % this.colsValue
				let absY = Math.floor(this.imageList.length / this.colsValue)
				let x = absX * this.viewWidth
				let y = absY * this.viewWidth
				this.imageList.push({
					src: item,
					x,
					y,
					oldX: x,
					oldY: y,
					absX,
					absY,
					scale: 1,
					zIndex: 9,
					opacity: 1,
					index: this.imageList.length,
					id: this.guid(16),
					disable: false,
					offset: 0,
					moveEnd: false
				})
				this.add.x = (this.imageList.length % this.colsValue) * this.viewWidth + 'px'
				this.add.y = Math.floor(this.imageList.length / this.colsValue) * this.viewWidth + 'px'
			},
			nothing() {},
			rpx2px(v) {
				return this.width * v / 750
			},
			guid(len = 32) {
				const chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('')
				const uuid = []
				const radix = chars.length
				for (let i = 0; i < len; i++) uuid[i] = chars[0 | Math.random() * radix]
				uuid.shift()
				return `u${uuid.join('')}`
			}
		}
	}
</script>

<style lang="scss" scoped>
	.con {
		// padding: 30rpx;

		.area {
			width: 100%;

			.view {
				display: flex;
				justify-content: center;
				align-items: center;

				.area-con {
					position: relative;
					overflow: hidden;

					.pre-image {
						width: 100%;
						height: 100%;
					}

					.del-con {
						position: absolute;
						top: 0rpx;
						right: 0rpx;
						padding: 0 0 20rpx 20rpx;

						.del-wrap {
							width: 36rpx;
							height: 36rpx;
							background-color: rgba(0, 0, 0, 0.4);
							border-radius: 0 0 0 10rpx;
							display: flex;
							justify-content: center;
							align-items: center;

							.del-image {
								width: 20rpx;
								height: 20rpx;
							}
						}
					}
				}
			}

			.add {
				position: absolute;
				display: flex;
				justify-content: center;
				align-items: center;

				.add-wrap {
					display: flex;
					justify-content: center;
					align-items: center;
					background-color: #eeeeee;
				}
			}
		}
	}
</style>